Vacuum Pipes From Turbo

[KMIT5368]

DOES ANYONE KNOW THE INTERNAL DIAMETER OF THE VACUUM PIPES COMING OF THE TURBO ON MY R REG 1.9TDI

[a18nkd]

hi i just replaced my pipes from the turbo on my mk1 galaxy 1.9 tdi and i used a internal diameter of 3.5mm but there is a different size hose on the very top as you look at the engine it goes from the n75 valve to a disk like bit on the air intake manifold i don't have the size of this (i used 3 mtrs of cotton over braided hose to do this)